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Chapter 100 Monster
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... n this era ... even the oxygen content has changed."
If the oxygen content in the air is still the same as in pre-civilization, it is impossible for such a huge organism to appear, because the concentration of oxygen is not enough to meet the needs of large organisms.
But if modernity is a high-oxygen environment, how can humans adapt? That will cause oxygen poisoning, because the lungs can't bear it in the first place!
And if it is a high-oxygen environment, human beings wi ...
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